You should work in groups of 2 or 3 students and go through as many problems as

Question

You should work in groups of 2 or 3 students and go through as many problems as you can. Do not move forward until your group has reached an agreement about each answer. We have a sample of cesium metal in a tube like that shown in the figure. An intense blue light strikes the metal surface, and lots of photoelectrons are emitted. The photoelectrons each have a kinetic energy K. A weaker blue light strikes the metal surface, and fewer photoelectrons are emitted. Can you explain this using the classical model that the light is an electromagnetic wave? If yes. do so. If not, what would the classical theory predict? Can you explain the result of part (a) using the quantum model that the light consists of particles, photons, each with energy L = hf? If yes, do so. If not, what would the quantum model predict?

Explanation / Answer

Work function = phi
In case of Blue light, the intensity is high, so higher number of photons, assuming one electron emissino per photon, we have more photoelectron ejections as compared to the weak blue light which as less intensity ( i.e. less number of photons)

AS both rays have same frequency, so Same amount of E is imparted to the sample. SO this can predict the energy of ejected photoelectrons, but not the number

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